[Endoperez]

The modding documents were made by the developers, and only recently reorganized when they decided to make Edi's unofficial reorganization official. Sometimes the developers forget that they haven't told us things, and every now and then they even forget some of the things they put into the game.

The limits of spesific types of modding can cause problems. If something isn't mentioned in the modding manuals, it's probably impossible. As an example, you can change which nations build which fortresses, but not the fortresses themselves, and you can't change poptypes directly but you can change the units that are recruited from them.

There are few workarounds, so it's worth asking about your problems here, but those are often very situational. If you give a little more detail on the mod you're planning, you'll get much more detailed answers on whether it's easy or not and what to look at to see how it could be done.